If you got some problems on ASIX USB to LAN products, please download the
How to identify authentic ASIX USB to LAN Products
document to double check if your USB to LAN device includes an
Non-authentic ASIX USB to LAN solution inside or not? If yes, please contact the manufacturer of your
USB to LAN device to get proper drivers instead. ASIX DOES NOT GUARANTEE AND PROVIDE ANY SUPPORT FOR
THOSE NON-AUTHENTIC ASIX PRODUCTS.

MCS9922 -- PCIe to Dual Serial Controller

MCS9922 is a single lane multifunction PCI express to I/O controller. It supports two serial ports and eight GPIO's. MCS9922 also provides an option for peripheral expansion through proprietary Cascade interface. The generic cascade interface allows interconnecting with similar chips like MCS9900 to expand the peripheral ports.

The serial ports are compatible with RS232, RS422 & RS485 standards and supports throughput from 50bps to 16Mbps. All the GPIO pins are programmable and can be used as Input or Output. An I²C interface is provided to configure MCS9922 device options through an external EEPROM.

Cascade:MCS9922 supports a 13-Pin proprietary interface to connect to other ASIX devices for IO expansion. Through this interface, MCS9922 can be used as Cascade Secondary device and can be connected to Cascade Primary capable ASIX Devices like MCS9900. Eg. MCS9922 can be connected to MCS9900, for following product configurations.